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Table 2 The obtained factors with total variances explained in descending order

From: Caffeine improves work durability and physical performance in anaerobic exercises among active adults in Tripoli Lebanon

Component Initial eigen values
Total % of Variance Cumulative %
1. Caffeine picks me up when I’m feeling tired 6.840 42.747 42.747
2. I am easily stressed after having caffeine 1.612 10.077 52.824
3. Caffeine improves my athletic performance 1.394 8.713 61.537
4. I feel less sleepy after having caffeine 1.015 6.343 67.879
5. Caffeine improves my mood .806 5.038 72.917
6. Workouts are better after having caffeine .645 4.029 76.946
7. Caffeine increases my motivation to work .545 3.408 80.354
8. Caffeine at any time throws off my sleep .488 3.048 83.403
9. Caffeine makes me feel nervous .480 3.000 86.403
10. Caffeine makes me feel more alert .433 2.709 89.112
11. Caffeine improves my concentration .372 2.325 91.437
12. Caffeine helps me work over long period of time .340 2.122 93.559
13. I would be unable to function without caffeine .321 2.008 95.566
14. Caffeine improves my attention .294 1.839 97.406
15. I can exercise longer if I have caffeine .232 1.452 98.858
16. Caffeine makes me feel more energetic .183 1.142 100.000
  1. Extraction method: principal component analysis